Flexible PLLs Trim Phase Noise

Promising the utmost in phase noise performance, the ADF4151 and ADF4196 PLL synthesizers target designs such as basestations, pulse, and Doppler radar, to name a few. With a bandwidth of 3.5 GHz, the ADF4151 supports a fractional-N or integer-N PLL synthesizer. It integrates a digital phase frequency detector (PFD), charge pump, and a programmable reference divider. The ADF4196 is a fast-settling, 6-GHz fractional-N PLL meeting GSM/EDGE lock time requirements. Partnering with an external loop filter and VCO, the device achieves lock times of less than 5 μs. It also packs a digital PFD and a precision differential charge pump. Available now in a 32-LFCSP, price for the ADF4151 is $2.43 each/10,000.  ANALOG DEVICES, INC., Norwood, MA. (800) 426-2564.